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pcre: enable UCP, UTF-8 (if available), extend t/19-match

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This commit is contained in:
Michael Stapelberg
2011-09-11 11:40:51 +01:00
parent 1a91c695e7
commit c1c1730516
2 changed files with 51 additions and 8 deletions
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29
src/regex.c
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@ -21,16 +21,31 @@
*/
struct regex *regex_new(const char *pattern) {
const char *error;
int offset;
int errorcode, offset;
struct regex *re = scalloc(sizeof(struct regex));
re->pattern = sstrdup(pattern);
if (!(re->regex = pcre_compile(pattern, 0, &error, &offset, NULL))) {
ELOG("PCRE regular expression compilation failed at %d: %s",
/* We use PCRE_UCP so that \B, \b, \D, \d, \S, \s, \W, \w and some POSIX
* character classes play nicely with Unicode */
int options = PCRE_UCP | PCRE_UTF8;
while (!(re->regex = pcre_compile2(pattern, options, &errorcode, &error, &offset, NULL))) {
/* If the error is that PCRE was not compiled with UTF-8 support we
* disable it and try again */
if (errorcode == 32) {
options &= ~PCRE_UTF8;
continue;
}
ELOG("PCRE regular expression compilation failed at %d: %s\n",
offset, error);
return NULL;
}
re->extra = pcre_study(re->regex, 0, &error);
/* If an error happened, we print the error message, but continue.
* Studying the regular expression leads to faster matching, but it’s not
* absolutely necessary. */
if (error) {
ELOG("PCRE regular expression studying failed: %s\n", error);
}
return re;
}
@ -43,8 +58,8 @@ struct regex *regex_new(const char *pattern) {
bool regex_matches(struct regex *regex, const char *input) {
int rc;
/* TODO: is strlen(input) correct for UTF-8 matching? */
/* TODO: enable UTF-8 */
/* We use strlen() because pcre_exec() expects the length of the input
* string in bytes */
if ((rc = pcre_exec(regex->regex, regex->extra, input, strlen(input), 0, 0, NULL, 0)) == 0) {
LOG("Regular expression \"%s\" matches \"%s\"\n",
regex->pattern, input);
@ -57,7 +72,7 @@ bool regex_matches(struct regex *regex, const char *input) {
return false;
}
/* TODO: handle the other error codes */
LOG("PCRE error\n");
ELOG("PCRE error %d while trying to use regular expression \"%s\" on input \"%s\", see pcreapi(3)\n",
rc, regex->pattern, input);
return false;
}